Nanoparticle arrays formed by spatial compartmentalization in a complex fluid

被引:51
作者
Firestone, MA
Williams, DE
Seifert, S
Csencsits, R
机构
[1] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA
[2] Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA
关键词
D O I
10.1021/nl0155025
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A mesoscopically ordered lamellar gel phase of a polymer-grafted, lipid-based complex fluid is used as a scaffolding to spatially organize inorganic nanoparticles. The complex fluid provides both a highly anisotropic environment and a segregated aqueous and organic domains in which inorganic nanoparticles can be selectively placed by tailoring their size and surface characteristics. Three types of silver nanoparticles underivatized, surfactant-stabilized, and dodecanthiol-derivatized-were evaluated. Comparison of the surface plasmon resonance of the various silver particles dispersed in conventional solvents to those contained within the complex fluid was used to determine the region of spatial localization in the lamellar gel phase. Silver particles rendered hydrophobic by capping with an alkane thiol insert into the hydrocarbon bilayer region. Surfactant-stabilized and underivatized silver nanoparticles reside in the aqueous channels, with the latter particles preferentially interacting with the grafted PEG chains/charged membrane interface region. Interparticle interaction between encapsulated hydrophilic silver particles can be enhanced by increasing the number of PEG repeat units (i.e., the length of the lipid-appended polymer). Examination of the X-ray diffraction profiles indicates that the gel-phase structure of the complex fluid is preserved upon introduction of all three types of nanoparticles. Guinler analysis of the low-q SAXS data for the intercalated silver yields particle sizes that are in good agreement with those determined by TEM prior to introduction, indicating that they remain as nonaggregated, discrete nanoparticles, These results not only demonstrate the use of complex fluids as a matrix in which to produce periodic arrays of encapsulated nanoparticle guests, but also suggest the possibility of employing them to modulate interactions between guests and, hence, their optical and electronic properties.
引用
收藏
页码:129 / 135
页数:7
相关论文
共 35 条
[11]  
Guinier A., 1994, XRAY DIFFRACTION CRY
[12]  
Guinier G Fournet A., 1955, SMALL ANGLE SCATTERI
[13]   Pressure/temperature phase diagrams and superlattices of organically functionalized metal nanocrystal monolayers: The influence of particle size, size distribution, and surface passivant [J].
Heath, JR ;
Knobler, CM ;
Leff, DV .
JOURNAL OF PHYSICAL CHEMISTRY B, 1997, 101 (02) :189-197
[14]   Spectrophotometric observations of the adsorption of organosulfur compounds on colloidal silver nanoparticles [J].
Henglein, A ;
Meisel, D .
JOURNAL OF PHYSICAL CHEMISTRY B, 1998, 102 (43) :8364-8366
[15]   ELECTRONICS OF COLLOIDAL NANOMETER PARTICLES [J].
HENGLEIN, A .
BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 1995, 99 (07) :903-913
[16]   Comparative study of dodecanethiol-derivatized silver nanoparticles prepared in one-phase and two-phase systems [J].
Kang, SY ;
Kim, K .
LANGMUIR, 1998, 14 (01) :226-230
[17]   Assembly and self-organization of silver nanocrystal superlattices: Ordered "soft spheres" [J].
Korgel, BA ;
Fullam, S ;
Connolly, S ;
Fitzmaurice, D .
JOURNAL OF PHYSICAL CHEMISTRY B, 1998, 102 (43) :8379-8388
[18]   Electrophoretic deposition of ligand-stabilized silver nanoparticles synthesized by the process of photochemical reduction [J].
Li, HX ;
Lin, MZ ;
Hou, JG .
JOURNAL OF CRYSTAL GROWTH, 2000, 212 (1-2) :222-226
[19]   SURFACE-CHEMISTRY OF COLLOIDAL SILVER - SURFACE-PLASMON DAMPING BY CHEMISORBED I-, SH-, AND C6H5S- [J].
LINNERT, T ;
MULVANEY, P ;
HENGLEIN, A .
JOURNAL OF PHYSICAL CHEMISTRY, 1993, 97 (03) :679-682
[20]  
Loweth CJ, 1999, ANGEW CHEM INT EDIT, V38, P1808, DOI 10.1002/(SICI)1521-3773(19990614)38:12<1808::AID-ANIE1808>3.0.CO